EP0161988A1 - Automatic device for the retarding of a booklet before being rectangularly folded in a folder of a printing machine - Google Patents

Abstract

The invention relates to a device for automatically adjusting the deceleration of the notebook before folding in the square folds of printing press folders. The device is characterized in that it comprises: a single detector (27) arriving at the stop of the notebook; a time relay (29) connected to said detector and provided with a closing contact (30) and an opening contact (31), and two different chains for controlling the phase adjustment motor: a chain " more advance ”with relay (K 1) and comprising the contact (30) making“ more advance ”until the detector (27) causes the opening of the contact (30) and the closing of the contact ( 31); a "less advance" relay chain (K 2) and comprising the contact (31) "making less" advance until the detector (27) causes the contact (30) to close and to open of the contact (31) hence an adjustment of the "just" notebook in abutment. The invention applies, in general, to the field of printing presses.

Description

The invention relates to a device for automatically adjusting the deceleration of the notebook before folding in the square folds of printing press folders.

The angle fold system is well known to manufacturers of folding presses for web printing presses.

It consists of making an additional fold on a notebook already cut and folded and transported to the folding station between two sets of belts.

The object of the present invention is to make automatic adjustment of the devices for slowing down the notebook before folding.

Systems for adjusting the phase of the square folds are already known. These systems include two notebook passage detectors, one doing more ahead and the other doing less. These devices eliminate folding on the stop and are, therefore, of little interest since the folding carried out "on the fly" is done at an angle. (See Figures 1 and 2 of the accompanying drawings).

The notebook (1) to be folded is brought to the folding station between two sets of conveyor belts (2) and (3). The belts (2), placed under the notebook, cooperate with the belts (3) placed above to drive the notebook (1) towards the stop (4). This stop (4) is notched in line with the belts (2) and (3) to allow them to pass.

The notebook (1) on the other hand stops on the bûté (4), which it cannot cross. Two folding rollers (5), rotating in opposite directions, are placed under the table (6) which is notched in its center to allow passage to the notebook (1) during folding.

A reciprocating knife (7), mounted oscillating above the folding rollers (5) and arranged so that its edge is parallel to the contact generators of the rollers (5), makes it possible to introduce the notebook between the rollers (5 ).

The knife is articulated around an axis (8), parallel to that of the rollers (5) and receives a movement of a connecting rod and crank mechanism (9) and (10). The rotation of this connecting rod and crank system is ensured by the following kinematic chain: bevel gear (11 and 12), helical gears (13 and 14), (15 and 16).

The gear (16) is rotated by the shaft (17), linked to the control of the folder, so that each book produced, the shaft (17) makes a turn.

It is understood that if the pairs of gears (15 and 16) on the one hand, (13 and 14) on the other hand and (11 and 12), finally are all three in the ratio 1/1, the knife (7) will make an oscillation for each notebook delivered.

The locking of a crank pin (9) on its shaft is carried out so that the knife (7) touches the bending book (1), substantially at the moment when the latter reaches the fixed stop (4).

The axial position of the helical gears (14) and (15), integral with each other, is determined by a screw nut system. The screw (18) is stopped in translation to the frame, but free to rotate. It is screwed into the nut (19), stopped in rotation but free axially and which therefore, by means of a ball bearing (20) axially displaces the train of helical gears (14) and (15).

The screw is linked by gears (21) and (22) to an electric motor (23). The nut (19) is further provided with limit switch contacts (24) and (25) which limit the travel of this nut and the axial movement of the gears (14) and (15).

The motor (23) is electrically controlled by a control box (26), to which are also connected the limit switches (24) and (25).

A photoelectric cell (27), placed in a notch in the stop of the square fold (4) gives a signal whenever the notebook (1), during folding, reaches the stop (4). This cell is also connected to the control box (26) which receives, in addition by a conductor (28), a signal during the whole time when the press conductor presses the "+ fast" button at press control console to increase press speed.

The whole system of axial displacement of the pair of helical intermediate gears (14) and (15) makes it possible to vary the phase of the folding knife (7) relative to the time of arrival of the notebook (1) on the stop (4).

Indeed, an axial displacement of the gear (15), to the right for example, causes a rotation of the gear (14) and therefore of the gear (13). But the movement of the gear (14) to the right causes an additional rotation of the gear (13) which, being in the same direction as the first, is added to the latter.

This system is well known to those skilled in the art who use it routinely to achieve phase adjustment, limited stroke.

It is understood that the notebook (1), in its movement towards the stop (4), pinched between the sets of belts (2) and (3), is braked when the knife (7) touching it, forces it to rub on the table (6), then the rollers (5).

The adjustment of the phase of the knife (7) relative to the abutment of the notebook (1) makes it possible, precisely, to make the knife (7) touch the notebook, at a distance from the stop (4) more or less and this while the folder is running.

If the knife (7) touches the notebook (1) while the latter is very far from the stop (4) (significant knife advance), the notebook never reaches the stop (4) because it is folded "at theft "by the rollers (5-5) before reaching it.

On the other hand, if the advance of the knife is low or zero, that is to say if the notebook (1) reaches the stop (4) with full force and without having been braked by the action of the knife (7) and from the table (6), the notebook is deformed or even torn in its impact on the stop (4) when the folder operates at high speed.

The present invention relates to an automatic mechanism which makes it possible to adjust the advance of the knife so that the notebook to be folded reaches "just" the stop (4) whatever the grammage of the notebook, the pagination or the various braking forces which are can apply to it: brushes, vacuum and whatever the speed of the machine.

• . un seul détecteur d'arrivée en butée du cahier ;
• . un relais temporisé relié audit détecteur et muni d'un premier contact à la fermeture et d'un second contact à l'ouverture ; et
• . deux chaînes différentes de commande du moteur de réglage de phase :
  • - une chaîne "plus d'avance" à relais et comprenant le premier contact, faisant plus d'avance jusqu'à ce que le détecteur provoque l'ouverture dudit premier contact et la fermeture dudit second contact ;
  • - une chaîne "moins d'avance" à relais et comprenant ledit second contact à l'ouverture, faisant "moins d'avance" jusqu'à ce que le détecteur provoque la fermeture du premier contact et l'ouverture du second contact, d'où un réglage du cahier "juste" en butée.

The invention relates in particular to a device for automatically adjusting the deceleration of the notebook before folding in the angle folds of the printing press brake, characterized in that it comprises:

• . a single arrival detector in abutment of the notebook;
• . a time relay connected to said detector and provided with a first contact on closing and a second contact on opening; and
• . two different phase control motor control chains:
  • - A "more advance" relay chain comprising the first contact, making more advance until the detector causes the opening of said first contact and the closing of said second contact;
  • - a "less advance" relay chain comprising said second contact on opening, making "less advance" until the detector causes the closure of the first contact and the opening of the second contact, d 'where an adjustment of the notebook "just" in stop.

• . Les figures 1 et 2 sont des vues respectivement en plan et en élévation d'un système connu de réglage de la phase des plis d'équerre ;
• . La figure 3 est le schéma électrique d'un dispositif de réglage selon l'invention ;
• . Les figures 4 et 5 sont des vues respectivement en élévation latérale et en plan d'un réglage de ralentissement exercé sur une dépression.

Other characteristics and advantages of the present invention will emerge from the description which follows, given with reference to the appended drawings in which:

• . Figures 1 and 2 are respectively plan and elevation views of a known system for adjusting the phase of the square folds;
• . Figure 3 is the electrical diagram of an adjustment device according to the invention;
• . Figures 4 and 5 are views respectively in side elevation and in plan of a slowdown adjustment exerted on a depression.

• Un amplificateur relais temporisé (29) qui est muni d'un contact à la fermeture (30) et d'un contact à l'ouverture (31) reçoit les impulsions en provenance de la cellule photo-électrique (27), qui délivre une impulsion toutes les fois qu'un cahier, en cours de pliage, atteint la butée (4) .

The principle of the automatic adjustment device according to the invention is as follows (Fi ^g . 3):

• A timed relay amplifier (29) which is provided with a closing contact (30) and an opening contact (31) receives the pulses coming from the photocell (27), which delivers a impulse whenever a notebook, during folding, reaches the stop (4).

This relay is reset each time if the pulses follow one another with a period less than its setting time "t". It delivers, in this case, a permanent signal "notebook in abutment".

Otherwise, it delivers a "notebook not in stop" signal. The signal "notebook in abutment" causes the rotation of the phase adjustment motor (23) to stop in the "more advance" direction. The "notebook not in stop" signal causes the motor to rotate in the "less advance" direction.

In addition, when the press operator presses the "faster" button on the press control panel, or on an "automatic stop" button, while the notebook is in stop, the phase adjustment motor ( 23) turns in the "more advance" direction until the notebook is no longer in abutment. When the notebook is no longer in abutment, the phase adjustment motor starts again in the "less advance" direction to bring the notebook just in abutment.

The device according to the invention further comprises two different chains for controlling the phase adjustment motor (23).

A control chain in the "more advance" direction comprising a relay (K 1) and said contact (30).

A control chain in the "less advance" direction comprising a relay (K 2) and said contact (31).

• . Un contact (32) de verrouillage électrique du ceLAIS (K 2)
• . Un contact de fin de course "plus d'avance" (33);
• . Un inverseur "automatique-manuel" (34);
• . En parallèle, le bouton-poussoir "+ vite" (35) du pupitre de commande de la presse, et un contact (36) d'auto-maintien du relais (K 1);
• . Le bouton "mise en butée automatique" (37) dudit pupitre ; et
• . Le contact (30) de "cahier en butée".

The relay chain (K 1) for controlling the phase motor (23), in the "more advance" direction, comprises:

• . A contact (32) for electrical locking of the CELAIS (K 2)
• . A "more advance" limit switch (33);
• . An "automatic-manual" inverter (34);
• . In parallel, the "faster" push button (35) on the press control console, and a contact (36) for self-maintaining the relay (K 1);
• . The button "automatic stop" (37) of said console; and
• . The contact (30) of "stop notebook".

• . Un contact (38) de verrouillage électrique du relais (K 1);
• . Un contact de fin de course "moins d'avance" (39);
• . Un inverseur "automatique-manuel" (40); et
• . Le contact (31) de "cahier non en butée".

The relay chain (K 2) for controlling the phase motor (23) in the "less advance" direction, comprises:

• . An electrical locking contact (38) of the relay (K 1);
• . A "less advance" limit switch (39);
• . An "automatic-manual" inverter (40); and
• . The contact (31) of "notebook not in abutment".

In addition, if one wishes to obtain operation in manual mode, it suffices to reverse the contacts (34) and (40) and to control the phase motor by push buttons (41A), "less on stop". and (41B) "more on stop". In this case, an indicator light (42) allows the operator to appreciate the fact that the notebook comes or does not come into abutment.

• Lorsque la machine est en fonctionnement et que le cahier ne vient pas en butée, le contact (31) est fermé et le moteur de phase tourne dans le sens où il met moins d'avance. Comme l'on met moins d'avance au pliage, le cahier va venir plus en butée jusqu'à ce que la cellule le voit et arrête le moteur de phase en ouvrant le contact (31).

The operation can be summarized as follows:

• When the machine is in operation and the notebook does not come to a stop, the contact (31) is closed and the phase motor rotates in the direction in which it puts less advance. As we put less advance in the folding, the notebook will come more in abutment until the cell sees it and stops the phase motor by opening the contact (31).

If during operation of the machine, the operator acts on the "+ fast" button (35), while the notebook is in abutment and the motor is not at the end of its travel, the relay (K 1) phase motor control will go up and self-power through its contact (36), making more advance until the cell, no longer seeing the notebook, opens the contact (30) and closes the contact (31).

We see that this system always regulates the "right" notebook in abutment.

Variants can be made to the above invention, the description of which has been given for information only, without however going beyond the ambit of the invention.

Thus the stop arrival detector can be a photoelectric cell as described above, whether of the transmission type or of the reflection type, or even of the pneumatic pneumatic type or even a simple electrical contact or a piezoelectric or capacitive detector or any other kind of contact.

Likewise, the mechanism of the square fold can be of the well-known type known as a "reel", in which the knife or blade describes a hypocycloid with two cusps.

Finally, the phase shift can also be done by epicyclic gear or by harmonic differential reducer, instead of the system with axial displacement of chevron gears, without departing from the scope of the present invention.

Figures 4 and 5 show a method of slowing down the notebook produced by action on a suction force acting on the notebook, as described in French patent 8309350 of June 6, 1983 in the name of the Applicant.

A fan (45) produces a vacuum in two boxes (46) located under the square fold table (6) and applying to the notebook (1) by a series of holes (47) drilled in the table.

The throttle valve (43) mounted in "by pass" and controlled by a motor (44) is under the control of the automation (26) according to an action by "more vacuum" and by "less vacuum".

In this case, the advance control is manual. It is also possible to control the notebook's braking brushes, brushes which are usually mounted near the stop, in contact with the notebook, for controlling the automation (26).

The action is done by "tighter brushes" and by "less tight brushes".

The invention also relates to any combination of these various complementary slowdown modes.

Claims (6)

1 - Device for automatically adjusting the deceleration of the notebook before folding in the square folds of printing press brakes, of the type comprising detectors for the presence of the notebook against a folding stop; means involved in folding the notebook and which may include: . a knife (7) rollers (5) . depression holes (47) . a kinematic chain (11 to 22) . an electric phase adjustment motor (23) . brake brushes,
characterized in that it comprises: . a single detector (27) arriving at the stop of the notebook; . a time relay (29) connected to said detector and provided with a closing contact (30) and an opening contact (31); and . two different phase control motor control chains: - a relay "more advance" chain (K 1) and comprising the contact (30) making "more advance" until the detector (27) causes the contact (30) to open and the contact closure (31); . a contact (32) for electrical locking of a relay (K 2) of a "less advance"chain; . a "more advance" limit switch (33); . in parallel, the "+ fast" push button (35) of the press control console and a self-holding contact (36) of the relay (K 1); and - said relay "less advance" chain (K 2) comprising the contact (31) making "less advance" until the detector (27) causes the contact (30) to close, and the opening of the contact (31) where an adjustment of the notebook "just" in abutment. 2. Device according to claim 1 characterized in that the chain "more advance" further comprises . an "automatic-manual" inverter (34); . an “automatic abutment” button (37) at said desk. 3 - Device according to claim 1, characterized in that the "less advance" chain comprises, in addition to said relay (K 2) and said contact (31): . An electrical locking contact (38) of the relay (K 1); . A "less advance" limit switch (39); . An "automatic-manual" inverter (40). 4 - Device according to any one of claims 1 to 3 characterized in that the adjustment of the deceleration is done according to a phase adjustment exerted by the motor (23) on the knife (7). 5 - Device according to any one of claims 1 to 3 characterized in that a slowdown adjustment mode is made according to an adjustment exerted on the depression by the holes (47). 6 - Device according to any one of claims 1 to 3, characterized in that a slowdown adjustment mode is made according to an adjustment exerted on the brushes.

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